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   82022
   We propose to monitor the important short period (4.2 day) binary
   system V444~Cyg for two weeks with ASCA, to provide coverage over 3
   complete orbital cycles. These observations will provide the most
   detailed orbital lightcurve of any colliding wind system, and determine
   the extent of any non phase related variability. V444~Cyg is of
   particular importance in that it is the best example of a short period
   colliding wind binary system, and is a key testing ground for our
   understanding of wind-wind interactions, W-R winds and W-R stars in
   general.
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